Measuring entomological parameters before implementing a study on asymptomatic carriers of Plasmodium falciparum in the Zè District in southern Benin

Malaria Journal

Research

Lenucthadius Houessou¹  Christophe Soares¹  Aziz Bouraima¹  Armel Djènontin¹  Montchédé Anato¹  Boris-Enock Zinsou²  Achille Massougbodji²  Yannelle Dossou²  Célia Dechavanne³  Gilles Cottrell³  Jerome Clain³ 

[1] Centre de Recherche Pour La Lutte Contre Les Maladies Infectieuses Tropicales (CReMIT), Université d’Abomey-Calavi (UAC), BP 526, Cotonou, Bénin;Centre de Recherche Entomologique de Cotonou (CREC), 06 BP 2604, Cotonou, Bénin;Institut de Recherche Clinique du Bénin (IRCB), 04 BP 1114, Cotonou, Bénin;Université Paris Cité, IRD, MERIT, 75006, Paris, France;Centre d’Etude Et de Recherche Sur Les Pathologies Associées À La Grossesse Et À L’Enfance (CERPAGE), Cotonou, Bénin;

关键词: Malaria;    Transmission;    Zè District;    Anopheles gambiae;    Insecticide resistance;   

DOI  :  10.1186/s12936-023-04450-4

 received in 2022-04-07, accepted in 2023-01-10,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundThe objective of this study was to estimate malaria transmission and insecticide resistance status in malaria vectors in Adjrako village from Zè District in Southern Benin. The present study was carried out prior to investigations on infectivity of blood from asymptomatic carriers of Plasmodium falciparum to malaria vector mosquitoes.MethodsHuman landing collections (HLCs) were performed in Adjrako village during the rainy season (September—November 2021). In this village, host-seeking mosquitoes were collected during three nights per survey from 22:00 to 06:00 in six randomly selected houses. Malaria vectors were dissected in orders to determinate their parity. Plasmodium falciparum infection in malaria vectors was determined by qPCR and the entomological inoculation rate (EIR) was calculated. The World Health Organization (WHO) insecticide susceptibility test-kits were used to evaluate the susceptibility of Anopheles gambiae sensu lato (s.l.) to deltamethrin at 0.05% and bendiocarb at 0.1%.ResultsA total of 3260 females of mosquitoes belonging to 4 genera (Anopheles, Culex, Aedes and Mansonia) were collected. Most of the mosquitoes collected were An. gambiae sensu lato (s.l.). The entomological inoculation rate (EIR) for the three collection months was 8.7 infective bites per person and the parity rate was 84%. Mortality rates of An. gambiae s.l. exposed to 0.05% deltamethrin and 0.1% bendiocarb were 18% and 96%, respectively, indicating that this vector population was resistant to deltamethrin and possibly resistant to bendiocarb in the study area.ConclusionThis study showed that malaria transmission is effective in the study area and that An. gambiae s.l. is the main malaria vector. The entomological parameters indicate this study area is potentially favourable for investigations on P. falciparum asymptomatic carriers.

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

Fig. 4